Physics Test 1

the tendency of objects to maintain their state of motion is called

inertia

While a car travels around a circular track at a constant speed, its] a. inertia is zero b. acceleration is zero c. velocity is zero d. none of the above

none of the above

what makes an element distinct

number of protons

a horse gallops a distance of 10 Kilometers in a time of 30 minutes. its average speed is

20 km/h

if you do 100 J of work in 50 s, your power output is

2W

a block is dragged with a constant speed in a straight line path across a level surface by a force of 6N. what is the force of kinetic friction between the block and the surface?

6 N

A ball tossed vertically upward rises, reaches its highest point, and then falls back to its starting point. During this time the acceleration of the ball is always

directed downward

An apple weighs 1 N. The net force on the apple when it is in free fall is

1 N

a ball moving at 3 m/s and has a momentum of 48 kg m/s. what is the balls mass?

16 kg

If two protons are removed from an oxygen nucleus, the result is

carbon

a 12N falling object encounter 4 N of air resistance. The magnitude of the netforce on the object is

8N

If an object of constant mass experiences a constant net force, it will have a constant

acceleration

a ball is dropped into a river from a very high bridge. at the same time, another identical ball is thrown straight down toward the water. neglecting air resistance, the acceleration just before striking the water.

is the same for each ball

An object may have potential energy because of its

location

a kilogram is a measure of an objects

mass

the total number of protons and neutrons in the nucleus of an atom will give you the atoms

mass number

two objects have the same size and shape, but one is much heavier than the other. when they are dropped simultaneously from a tower, they reach the ground at the same time, but the heavier one has a greater

momentum

An object that has kinetic energy must be

moving

consider newtons third law; as a ball falls, the action force is the pull of the of the earths mass on the ball. The reaction force is the

pull of the balls mass on the earth

which of the following is NOT a vector quantity

speed

a ball rolling has its maximum kinetic energy at

the bottom

If an object is raised twice as high, its potential energy will be

twice as much

If you push an object twice as far while applying the same force, you do

twice as much work

while an object near the earts surface is in free fall, its

velocity increases

A car maintains a constant velocity of 100 km/hr for 10 seconds. During this interval its acceleration is

zero